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April 2016 Observer

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April 2016 Observer The Denver APRIL 2016 OBSERVER M81, the large spiral galaxy at right, and M82, left, in Ursa Major. Visible in small telescopes, this pair lies about 12 million light-years from Earth, and about 150,000 light-years from each other. Image © Alan Erickson APRIL SKIES by Zachary Singer The Solar System If you’re up between 4 and 5 AM, look for the constellation high in Mercury is out of the solar glare, and toward the beginning of the the sky in the south—the familiar scorpion outline looks surprisingly month, it presents a bright, -1 magnitude gibbous disk about 6” across, crowded—and is a wonder on its own, naked-eye. Saturn, Mars, and and low in the west at sunset. As the days progress and the planet or- Antares make a brilliant triangle; Mars and Antares share their hue, bits the Sun, its phase, apparent size and brightness change; maximum but the planet greatly outshines the star. Mars’ apparent diameter will elongation comes on the 18th, when the planet will appear as a “lemon grow to about 16” this month; that’s about as good as it ever gets during wedge” nearly 20° above the horizon at sunset. (On practical basis, less-advantageous op- Mercury will still be more than 10° up that evening when the sky is positions, so these next Sky Calendar dark enough to make observation easier.) Towards the end of the month, weeks are already a 7 New Moon before disappearing in front of the sun, Mercury will become a thin good opportunity for 13 First-Quarter Moon crescent some 10” across, telescopic observa- 21 Full Moon In the Observer but very low on the hori- tion—but we’re not 29 Last-Quarter Moon zon. Those of us in Denver at opposition yet, and President’s Message . 2 proper will see the Front next month will be Range as a beautiful com- even better! (Saturn comes to opposition in early June.) Society Directory. 2 panion to the innermost Technically speaking, Jupiter is slightly diminished, appearing Schedule of Events . 2 planet, but folks close to about 7% smaller than last month as Earth speeds away from the giant DAS News . 3 the foothills may find their planet after opposition. Realistically, it’s still a stunning object, and at view blocked; if you’re about 41” across, it’s easy for all ’scopes. Jupiter is now a great object About the DAS . 3 in that group, try heading for kids, because they won’t have to stay up late to see it—look for the NASA Space Place . 4 eastward for a better line planet in the southeast around 9:30 PM at the beginning of April, and of sight. higher, on the Meridian, at month’s end. Mars and Saturn The Moon continues its recent habit of occulting Aldebaran, this are together in Scorpio! time on April 10th; for observers in southern Denver, the event will occur Continued on Page 6 THE DENVER OBSERVER APRIL 2016 Society Directory PRESIDENT’S MESSAGE by Ron Hranac DAS Executive Board Resources for Learning Astronomy President: Ron Hranac “How can I learn more about astronomy?” president@denverastro .org That question is one that we often hear from our new members and from folks who attend Denver Vice President: Astronomical Society Public Nights and Open Houses. The answer to the question definitely falls into Stuart Hutchins (Interim) vp@denverastro .org the “it depends” category, and might be answered with another question: “What would you like to Secretary: learn?” Jeff Tropeano A good place to start, of course, is with DAS. Our members’ knowledge covers a broad range, and secretary@denverastro .org we love to help others learn more about astronomy. Our monthly meetings at DU’s Olin Hall are a Treasurer: good resource—most feature an astronomy-related lecture. The subject matter can range from entry- Michael Nowak treasurer@denverastro .org level up to college and above. Check out our YouTube page for a sampling: https://www .youtube .com/ Executive Board Members: user/denverastro. Johnny Barela Ed Scholes Our Public Nights (http://www .denverastro .org/das/public-nights/), held every Tuesday and Thurs- Jack Eastman Lindsey Shaw Joe Gafford Ken Sturrock day at DU’s historic Chamberlin Observatory, feature an astronomy-themed lecture followed by ob- Chuck Habenicht Dan Wray serving through the powerful 20-inch Alvan Clark-Saegmuller telescope. (DAS members can attend Past President, Ron Pearson our Open Houses and Public Nights for free.) We also have an area for beginners on our web site at President Emeritus, Larry Brooks http://www .denverastro .org/das/for-beginners/ . Committees Sometimes the area of interest is nothing more than wanting help figuring out how to get the Moon Van Nattan-Hansen Scholarship Fund: or some other object to show up more easily in the eyepiece. (A common gotcha—the telescope’s Jeff Tropeano (Chair) PO Box 100621 finder isn’t aligned with the ’scope!) The first step is to look at the instruction manual, if one is avail- Denver, CO. 80250-0621 able. If the manual is missing, or it isn’t clear about the procedure, bring that ’scope to one of our Open EGK Dark Site Committee: Houses and ask for some hands-on assistance. Darrell Dodge, Interim Chair darksite@denverastro .org After our local telescope shop, S&S Optika, closed (Cathie and Tim Havens retired and moved to New Mexico), DAS member Digby Kirby took over the “how to choose a new telescope” and “how to IDA Representative: Dr. Robert Stencel use your new telescope” presentations normally done around the Christmas holiday season. He plans coloida@hotmail .com to do a couple more of these during the next several months at our Open Houses. Volunteers or Appointed Two magazines that cater to amateur astronomy—Astronomy, and Sky & Telescope—have a wealth Representatives of helpful information for beginners on their respective web sites. On Astronomy magazine’s site ALCor: (http://www .astronomy .com), click on the OBSERVING and VIDEOS tabs on the main page. On Sky Darrell Dodge 303 932-1309 & Telescope’s site (http://www .skyandtelescope .com), click on RESOURCES & EDUCATION and Newsletter Editor: Zachary Singer 303 718-4188 Continued on Page 5 editor@denverastro .org Newsletter Proofreaders: DAS SCHEDULE Darrell Dodge, Ron Hranac The Observer is available in color PDF format from the DAS website . Website: Darrell Dodge APRIL 2016 webmaster@denverastro .org IT Coordinator: 8-10 Dark Sky Weekend—EGK Dark Site & Brooks Observatory Ken Sturrock itdept@denverastro .org 16 Open House—DU’s Historic Chamberlin Observatory—Starts at 7:30 PM External Outreach Coordinator: 22 General Meeting at DU’s Olin Hall, Rm. 105, 7:30 PM Julie Candia 29 E-Board Meeting—At DU’s Historic Chamberlin Observatory, 7:30 PM external@denverastro .org Public Night Coordinator: Hugh Davidson 303 679-0629 Librarian: Phil Klos During Open House, volunteer members of the DAS Public Nights feature a presentation on astronomical DAS Information Line: bring their telescopes to the Chamberlin Observa- subjects and a small-group observing session on the (303) 871-5172 tory’s front (south) lawn, so the public can enjoy historic 20-inch telescope (weather permitting), at Cham- DAS Correspondence: views of the stars and planets, try out different berlin Observatory on Tuesday and Thursday evenings Denver Astronomical Society telescope designs, and get advice from DAS mem- (except holidays), beginning at the following times: bers. The Observatory is open, too (costs listed P.O. Box 102738 March 10 - September 30 at 8:30 PM Denver, Colorado 80250 below), and its historic 20-inch telescope is open president@denverastro .org for observing with no reservations necessary. October 1 - March 9 at 7:30 PM Open House costs (non-members): If the skies are clear, Public Night costs (non-members): $4/adult, The Executive Board conducts the business $2/person ($5/family), $1/person in inclement weather. of the DAS at 7:30 PM, at Chamberlin Ob- $3/child and students with ID. DAS mem- DU students with ID, and DAS members free. servatory . bers and DU students with ID: free. Please see the Schedule of Events for meeting Members of the public (non-DAS/DU, as above), please dates . All members are welcome . make reservations via our website http://www .denverastro .org (www .denverastro .org) or call (303) 871-5172. The Denver Astronomical Society One Mile Nearer the Stars Page 2 THE DENVER OBSERVER APRIL 2016 DAS NEWS Volunteer Opportunities Club Jackets April 10, 7:00AM (setup)-12PM. Maria Torres at (720) 326-1780, or email Dan Wray is taking orders for our black club jackets. The Tabling and, ideally, solar view- mtorres@healthylearningpaths .org . front has your first name embroidered on the right and Denver ing for participants of the 7th An- Astronomical Society printed on the left. The back of the jack- nual Frank Shorter RACE4Kids’ To volunteer, please contact Julie et has the DAS logo printed on it. We are offering both a light Health 5K and Health Odyssey, at Candia at external@denverastro .org weight jacket (essentially, a windbreaker or shell) and heavier the 1st Bank Center in Broomfield. —and thanks! one. It has been some time since we offered the light one. (For questions about the event, contact Prices: light jacket $79, heavy jacket $95; add $4 for sizes ∞ greater than XL—jackets must be paid for in advance. To order yours, send a check made out to “DAS” to Dan Wray, 3970 W. Dartmouth Ave., Denver, CO 80236; let him know the weight of the jacket, size, and the name to be embroidered. Contact: Dan Wray, (303) 922-0905, daniel_wray@comcast .net.
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